Emerson Liebert iCOM Manual De Usuario

Unit-2-Unit (U2U) communications via a private network will allow the following functions to be 

placed into operation when the requirement exists. The user must install the correct hardware 

(see 5.0 - Installing a Liebert iCOM Unit-to-Unit Network) and properly program the units for 

the selected functionality.
The Liebert iCOM network can perform the following functions:
The Teamwork Mode functions allow for multiple stages of cooling/heating and 

humidification/dehumidification. Teamwork Mode can be used to prevent environmental units from 

“fighting,” where one environmental unit might be cooling while another unit is heating.
The Standby (Lead/Lag) function allows one or more units to be set as “Running” and “Standby” for 

activation in case of an alarm. This function also allows the units to be programmed in a rotation to 

help ensure “Standby” unit operation.
The Cascade Operation function allows additional units to be staged-on based on the temperature 

or humidity requirement.
The Virtual Master function provides smooth control operation if the group’s communication is 

compromised. When the lead unit, which is in charge of component staging in teamwork, unit staging 

and standby rotation, becomes disconnected from the network, the Liebert iCOM automatically 

assigns a virtual master. The virtual master assumes the same responsibilities as the master until 

communication is restored.

Extensive upgrades to the Unit-to-Unit communication software prevent Liebert iCOM controls with 

PA2.01.48R software from being compatible with Liebert iCOM controls that have earlier versions of 

Liebert iCOM software. Liebert iCOM controls with PA2.01.48R software will not communicate with 

Liebert iCOM controls with PA1.XX.XXXSTD software.
Customers who have Liebert iCOM controls with the PA1.XX.XXXSTD software and who need 

additional Liebert iCOM units can:

• Purchase new units with the previous software installed at the factory
• Purchase new units with the PA2.01.48R software and have a properly trained and qualified 

technician downgrade the units to PA1.04.043.STD

• Have a properly trained and qualified technician upgrade the older unit(s) with PA2.01.48R

For further information, contact your local Emerson representative.

Groups of cooling units connected to a network can be set up to work together in any of these 

teamwork modes:

• No  Teamwork
• Teamwork Mode 1
• Teamwork Mode 2
• Teamwork Mode 3 (software Rev. PA2.00.05R or higher required)

All Liebert iCOM-controlled cooling units on a network must be set to run in the same teamwork 

mode.